ABS Warning Light Circuit: Wiring Diagram

Fig 1: ABS Warning Light Circuit - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECTION PROCEDURE 

1. PERFORM ACTIVE TEST BY TECHSTREAM (ABS WARNING LIGHT) 
   1. Using the Techstream Active Test, generate a control command and then check that the ABS warning light operates.

      ABS/VSC/TRAC 

      DIAGNOSTIC NOTE CHART
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      ABS Warning Light	Turns ABS warning light ON/OFF	Observe combination meter	-

      OK: ABS warning light is turned on or off in accordance with intelligent tester. 

   OK: REPLACE SKID CONTROL ECU 

   NG: Go to Next Step 

2. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) 
   1. Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter.

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to Next Step 

3. CHECK COMBINATION METER (ABS WARNING LIGHT) 
   1. Check the combination meter (see PROBLEM SYMPTOMS TABLE ).

   NG: REPAIR OR REPLACE COMBINATION METER 

   OK: REPLACE SKID CONTROL ECU